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Finding the Fourth Proportional to 109,109.80, 163,664.70 and 81,461.80

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Solution

The fourth proportional to 109,109.80, 163,664.70 and 81,461.80 is: 122,192.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,109.80 : 163,664.70 = 81,461.80 : x
  2. Step 2: Convert to fraction form
    109,109.80/163,664.70 = 81,461.80/x
  3. Step 3: Cross multiply
    109,109.80x = 163,664.70 × 81,461.80
  4. Step 4: Simplify right side
    109,109.80x = 13,332,421,058.46
  5. Step 5: Solve for x
    x = 13,332,421,058.46/109,109.80
  6. Step 6: Final answer
    x = 122,192.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.